[commit: ghc] ghc-8.6: circleci: Fix documentation building (d414a11)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.6
Link       : http://ghc.haskell.org/trac/ghc/changeset/d414a115379b960437acf2234e977e7563d3c468/ghc

>---------------------------------------------------------------

commit d414a115379b960437acf2234e977e7563d3c468
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Fri Aug 3 16:48:18 2018 -0400

    circleci: Fix documentation building
    
    (cherry picked from commit 9f937142f67ccf1c8bff9bb809539deca39a7a6f)


>---------------------------------------------------------------

d414a115379b960437acf2234e977e7563d3c468
 .circleci/config.yml                            | 21 ++++++++--------
 .circleci/images/i386-linux/Dockerfile          |  6 +++++
 .circleci/images/update-image                   | 33 +++++++++++++++++++++++++
 .circleci/images/x86_64-linux-fedora/Dockerfile | 20 ++++++++++++++-
 .circleci/images/x86_64-linux/Dockerfile        | 10 +++++++-
 .circleci/prepare-system.sh                     | 20 ++++++++++++---
 6 files changed, 95 insertions(+), 15 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc d414a115379b960437acf2234e977e7563d3c468